Deflection yoke

ABSTRACT

A deflection yoke for a television receiver set wherein a ring insulating cover having spring means is mounted on an outer periphery of an enlarged edge of a horizontal deflection coil of saddle shape and a rotary corrective magnet is mounted on the cover.

United States Patent Koji Yabase Tokyo, Japan Apr. 21, 1970 Nov. 2, 1971 Denki Onkyo Co., Ltd.

[72] Inventor [21 Appl. No. [22] Filed [45] Patented [73] Assignee Tokyo, Japan [32] Priorities Apr. 23, 1969 [3 3] Japan Apr. 23, 1969, Japan, No. 44/37227; Apr. 23, 1969, Japan, No. 44/237228; Apr. 24, 1969, Japan, No. 44/379239 [54] DEFLECTION YOKE 8 Claims, 17 Drawing Figs.

[52] U.S. Cl

[51] Int. Cl 1101f H00 [50] Field of Search 335/210, 212, 213, 75, 76, 77

[56] References Cited UNITED STATES PATENTS 3,296,570 l/l967 Uetake eta] 335/212 FOREIGN PATENTS 644,993 7/1962 Canada 335/212 1,011,918 12/1965 Great Britain 335/212 Primary ExaminerG. Harris Attorney-McGlew and Toren ABSTRACT: A deflection yoke for a television receiver set wherein a ring insulating cover having spring means is mounted on an outer periphery of an enlarged edge of a horizontal deflection coil of saddle shape and a rotary corrective magnet is mounted on the cover.

PATENTEDHiWe IBYI 3618.125

SHEET 1 [IF 4 IIIIIIIIIII ay flTm RTI'O'R N GYS BACKGROUND OF THE INVENTION This invention relates to a deflection yoke for a television receiver set of the type wherein no bobbin is used between horizontal and vertical deflection coils as in a transistor-type deflection yoke.

In the prior art deflection yoke, it has not been possible to mount a rotary corrective magnet because lack of the bobbin. In the deflection yoke of this kind, therefore, the bar magnet has been secured to opposite sides of the horizontal deflection coil by adhesive material, adhesive tape or the like, in order to adjust deflection magnetic field through the magnet. However, when the bar magnet is to be used as described above the mounting operation of the bar magnet during assembly is troublesome and the deflection magnetic field cannot be adjusted as desired and fine adjustment of the magnetic field cannot be attained.

SUMMARY OF THE INVENTION It is, therefore, an object of this invention to provide a deflection yoke wherein an insulating circular cover is mounted on an outer periphery of a horizontal deflection coil to'allow mounting of a rotary corrective magnet.

It is another object of this invention to provide a deflection yoke wherein the mounting operation of a magnet during assembly of the product can be simplified by mounting the circular cover.

It is a further object of this invention to provide a deflection yoke wherein the deflection magnetic field can be precisely adjusted at any desired time by the rotary correction magnet.

According to a preferred embodiment of the invention the deflection yoke comprises a vertical deflection coil formed with a pair of coil portions toroidal-wound on a core, a horizontal deflection coil formed with a pair of saddle-shaped coil portions mounted in the core, a flange portion mounted at the rear ends of both of said deflection coils, an insulating circular cover fitted and secured to the outer periphery of the front enlarged edge of the horizontal deflection coil by spring means, and a pair of cylindrical corrective magnets rotatably mounted on opposite sides of the circular cover.

BRIEF DESCRIPTION OF THE DRAWINGS Other objects, advantages and novel features of the invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings, wherein:

FIG. 1 is a plan view of a deflection yoke according to a preferred embodiment of this invention.

FIG. 2 is a front elevational view of the shown in FIG. 1.

FIG. 3 is an enlarged front view of a circular cover employed in the deflection yoke of FIG. 1.

FIG. 4 is a sectional view of the circular cover the line x--x ofFIG. 3.

FIG. 5 is a sectional view of the circular the line y--y ofFIG. 3.

FIG. 6 is a plan view of a deflection yoke according to another embodiment of the invention.

FIG. 7 is a front elevational view of the deflection yoke of FIG. 6.

FIG. 8 is a perspective view of a circular cover employed in the deflection yoke shown in FIG. 6.

FIG. 9 is a rear view of the circular cover shown in FIG. 8.

FIG. 10 is a plan view of a further form of deflection yoke according to this invention.

FIG. 11 is a rear view of the deflection yoke shown in FIG. 10.

FIG. 12 is a perspective view of a circular in the deflection yoke shown in FIG. 10.

FIG. 13 is a rear view of the circular cover shown in FIG. 12.

FIG. 14 is a plan view of a deflection yoke according to a still further embodiment of this invention.

deflection yoke taken along cover taken along cover employed FIG. 15 is a front elevational view of the FIG. 14.

FIG. 16 is a front elevational view of a circular cover employed in the deflection yoke shown in FIG. 14.

FIG. 17 is a front elevational view showing the configuration of a horizontal deflection coil.

DESCRIPTION OF PREFERRED EMBODIMENTS Referring now to the drawings, there is shown in FIGS. 1, 2, 3, 4 and 5 a deflection yoke 10 comprising a vertical deflection coil 12 formed by a pair of coil portions toroidal-wound on a core 11, a horizontal deflection coil 13 formed by a pair of saddle-shaped coil portions fitted inside the core and a flange portion 14 fixed to rear portions of both of the deflection coils.

Front portion of the horizontal deflection coil 13 of the deflection yoke 10 is formed with an enlarged edge 13a to contact with a cone of an image tube, the enlarged edge protruding from the front of the core 11. Mounted on the outer periphery of the enlarged edge 13a of the horizontal deflection coil 13 is a ring cover 20 of resilient insulating material. The ring cover is form with outwardly extending U- shaped bend portion 21a at one or more points on the ring surface 21 closely fitted to the outer periphery of the enlarged edge of the horizontal deflection coil, as shown in FIG. 3, the bend portion 21a being used as spring means. The resilient force of the bend portion serves to expand the diameter d, which is sized to be shorter than the horizontal diameter d, of the horizontal deflection coil 13 (shown in FIG. 17).

With the ring cover thus formed, if the circular surface 21 is fitted to the enlarged edge 13a of the horizontal deflection coil 13 while expanding the bent portion 21a to expand thediameter 11,, the ring surface 21 is brought into close contact with the enlarged edge 13a of the horizontal deflection coil by recovering force of the bend portion 21a. However, in order to improve the contact of the ring cover to the horizontal deflection coil, it is desirable to provide an arcuate wall surface 22 attached to the rear surface of the enlarged edge of the horizontal deflection coil at the rear end of the ring surface, as shown in FIGS. 3, 4 and 5. For similar reason, it is desirable to provide stop member 23 opposing to the wall surface 22 at the front end of the ring surface 21, as shown in FIGS. 3 and S. In this way, the enlarged edge 13a of the horizontal deflection coil 13 can be fitted to the channellike space 24 defined by the stop member 23 and the wall surface 22 to fix the ring cover 20 in place.

Secured to opposite sides of the ring cover 20 are elongated supporting arms 30, 30 made of magnetic material, by adhesive material or the like along circumferential direction of the ring cover, each of said supporting arms 30, 30 having magnet retainers 31, 31 on both sides of the enlarged edge of the horizontal deflection coil.

Rotatably mounted to the magnet retainers 31 of the supporting arms 30 are cylindrical magnets 40 magnetized diametrically and each having a center aperture 41 into which a tool such as screwdriver is inserted to rotate the magnet, a resilient piece 50 for preventing drop of the magnet 40 is normally fitted to the magnet retainer 31 of the supporting arm 30.

deflection yoke of In FIGS. 6, 7, 8 and 9, there is shown an embodiment of the invention in which an elliptic ring cover 60 made of resilient, insulating material is mounted on the deflection yoke 10 described in connection with the previous embodiment. The elliptic cover 60 shown herein has longer axis in vertical direction and shorter axis d;, in horizontal direction, the axis d being somewhat shorter than the diameter d, (shown in FIG. 17) of the enlarged edge 13a of the horizontal deflection coil 13, the recovering force for shape variation being used as spring means. The elliptic ring cover 60 has its ring surface fitted onto the outer surface of the enlarged edge 13a of the horizontal deflection coil 13 while its shorter axis 41;, is expanded. After fitting, the cover 60 is held in close contact because the ring surface 61 presses the opposite sides of the shorter axis against the opposite sides of the enlarged edge 13a of the horizontal deflection coil by the action of self-recovering force of the circular cover.

As in the circular cover 20 shown in F IG. 3 it is desirable to provide in the ring cover 60 the present embodiment a wall surface 62 attached to the rear surface of the enlarged edge of the horizontal deflection coil 13 and a stop member 63 defining channellike space 64 facing to the wall surface 62. In this case it is necessary to provide one or more cutout portions 65 which enable bending of the ring surface 61, at the rear side of the wall surface 62.

There is shown in FIGS. 10, ll, 12 and 13, a ring cover 70 which is a further improvement of the elliptic ring cover 60 described above.

The ring cover 70 has its longer axis along vertical direction and its shorter axis d. somewhat shorter than the diameter d shown in FIG. 17) of the enlarged edge 13a of the horizontal deflection coil 13. The ring cover 70 has its ring surface 71 fitted onto the outer surface of the enlarged edge 13a of the horizontal deflection coil 13 while expanding the shorter axis 11,. After fitting, it is held in close contact because the ring surface 71 has its short axis sides pressed against the opposite sides of the enlarged edge 13a of the horizontal deflection coil 13 by self-recovering force of the ring cover, as in the ring cover 60 shown in FIG. 8. In the ring cover 70 of the present embodiment there are further provided one or more resilient short segments 72, 72 which protrude into a clearance defined between the rear surface of the enlarged edge of the horizontal deflection coil 13 and the core 11 on which the vertical deflection'coil 12 is toroidal-wound to engage the ring cover with the deflection yoke 10. The short segments are formed to protrude toward the center of the ring cover from the rear end of the ring surface 71 of the ring cover 70.

It is desirable to provide wall surface 73 on the ring cover 70, which surface is similar to those rear wall surfaces 22 and 62 formed on the ring cover 20 shown in FIG. 3 and the ring cover 60 shown in FIG. 8. In this case, the short segments 72 projects from the wall surface 73. When such wall surface is thus formed it is necessary to form one or more cutout portions 74 on the wall surface 73 for bending of the ring surface 71, as in the ring cover 60 shown in FIG. 8.

Although there is not shown in F lG.'12 it is preferred to provide stop segment in the ring cover 70 of the present embodiment, which is similar to the stop segment 23 shown in FIG. 3.

in FIGS. 14, 15 and 16 there is shown a ring cover to be attached to the deflection yoke which cover is modified into an endless ring cover 80. The ring cover 80 includes a ring surface 81 formed to match the enlarged edge so that it may be fitted onto the outer periphery of the enlarged edge 13a of the horizontal deflection coil 13, and a resilient curved frame 82 serving as spring means, which extends toward the center of the ring cover and has its-opposite ends connected to the rear end ofthe ring surface 81.

The resilient curved frame 82 has its extended portion 82a fitted into a clearance S defined between the enlarged edge 13a of the horizontal deflection coil 13 and the core 11, and faced in a direction of the diameter of the ring cover to fix the ring cover 80 to the deflection yoke 10. in order to improve the contact of the ring cover 80 to the deflection yoke 10, the interval d of the extended portion 82a is made shorter than the outer diameter of the horizontal deflection coil at the clearance so that the cover is pressed against the outer surface of the horizontal deflection coil 13 at the clearance S.

in the ring cover 80 in accordance with the present embodiment, since the curved frame 82 is bent and the opening d" of the extended portion 82a is expanded so that the frame 82 passes over the front end of the core 11 and fitted between the core 11 and the horizontal deflection coil 13 and at the same time it presses against the horizontal deflection coil diametrically with uniform force, the ring cover 80 can be fixed to the deflection yoke in an improved manner.

In the ring covers illustrated in the previous embodiments a pair of rotary magnets 40, 40 are normally attached by the supporting arms before they are attached to the deflection yokes. Accordingly, after the ring cover is attached to the deflection yoke the ring cover is slightly rotated circumferentially to adjust the position of the magnet and thereafter the ring cover may be secured to the horizontal deflection coil by adhesive material or the like.

In the deflection yoke according to this invention, since the ring cover is fixed in place to the enlarged edge of the horizontal deflection coil by spring means, mounting of rotary magnets is possible and the mounting operation of the ring cover is simple. Furthermore, when the ring cover is to be rotated to adjust the position of the magnet the adjustment operation is simplified because the ring cover is held stopped by the spring means without allowing spontaneous rotation of the cover.

Obviously, many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.

Having described the preferred embodiments of the invention, what is claimed is:

l. A deflection yoke comprising a vertical deflection coil having a pair of coil portions toroidal-wound on a core, a horizontal deflection coil formed with a pair of saddle-shaped coil portions fitted into the core and having its enlarged end protruded forwardly of the core, an insulating ring cover fixed in place to the horizontal deflection coil by spring means and forming a ring surface to be fitted onto an outer periphery of the enlarged edge of the horizontal deflection coil, a pair of supporting arms of magnetic material attached to the outer periphery of the ring cover so that they are located on both sides of diametrically opposite ends of the horizontal deflection coil, and a pair of corrective magnets rotatably supported by the supporting arms and located on horizontally opposite sides of the horizontal coil.

2. A deflection yoke according to the claim 1 wherein said ring cover has on its ring surface an outwardly projecting U- shaped curved bend portion, spring action of which serves to bring the ring cover into close contact with the enlarged edge of the horizontal deflection coil.

3. A deflection yoke according to the claim 1 wherein said ring cover is formed into an elliptic configuration, the shorter axis of which is shorter than the horizontal diameter of the enlarged edge of the horizontal deflection coil, and said ring cover is fitted onto the enlarged edge of the horizontal deflection coil while expanding the shorter diameter of the ring cover.

4. A deflection yoke according to claim 1 wherein said ring cover include at its rear end of the ring surface a resilient short segment adapted to be inserted between the horizontal deflection coil and the core.

5. A deflection coil according to the claim 1 wherein said ring cover is formed in circular ring shape so as to be fitted onto the enlarged edge of the horizontal deflection coil, and resilient curved frames projecting toward the center are diametrically opposed at the rear end of the ring surface, said curved frames being adapted to be fitted into a clearance between the horizontal deflection coil and the core and to presses against the outer surface of the horizontal deflection coil when fitted into said clearance.

6. A deflection yoke according to the claim 1 wherein said ring cover has at the rear end of its ring surface a wall surface to be attached to the rear surface of the enlarged edge of the horizontal deflection coil.

7. A ring cover according to claim 6 wherein stop segment engaging with the front surface of the enlarged edge of the horizontal deflection coil is provided at the front end of the ring surface of the ring cover, to thereby forming a channellike space into which the enlarged edge of the horizontal deflection coil is fitted.

8. A ring cover according to the claim 3 wherein a wall surface to be attached to the rear surface of the enlarged edge of the horizontal deflection coil is provided at the rear end of the ring surface of the ring cover, and a cutout portion is formed on the wall surface.

I l 4' I l 

1. A deflection yoke comprising a vertical deflection coil having a pair of coil portions toroidal-wound on a core, a horizontal deflection coil formed with a pair of saddle-shaped coil portions fitted into the core and having its enlarged end protruded forwardly of the core, an insulating ring cover fixed in place to the horizontal deflection coil by spring means and forming a ring surface to be fitted onto an outer periphery of the enlarged edge of the horizontal deflection coil, a pair of supporting arms of magnetic material attached to the outer periphery of the ring cover so that they are located on both sides of diametrically opposite ends of the horizontal deflection coil, and a pair of corrective magnets rotatably supported by the supporting arms and located on horizontally opposite sides of the horizontal coil.
 2. A deflection yoke according to the claim 1 wherein said ring cover has on its ring surface an outwardly projecting U-shaped curved bend portion, spring action of which serves to bring the ring cover into close contact with the enlarged edge of the horizontal deflection coil.
 3. A deflection yoke according to the claim 1 wherein said ring cover is formed into an elliptic configuration, the shorter axis of which is shorter than the horizontal diameter of the enlarged edge of the horizontal deflection coil, and said ring cover is fitted onto the enlarged edge of the horizontal deflection coil while expanding the shorter diameter of the ring cover.
 4. A deflection yoke according to claim 1 wherein said ring cover include at its rear end of the ring surface a resilient short segment adapted to be inserted between the horizontal deflection coil and the core.
 5. A Deflection coil according to the claim 1 wherein said ring cover is formed in circular ring shape so as to be fitted onto the enlarged edge of the horizontal deflection coil, and resilient curved frames projecting toward the center are diametrically opposed at the rear end of the ring surface, said curved frames being adapted to be fitted into a clearance between the horizontal deflection coil and the core and to presses against the outer surface of the horizontal deflection coil when fitted into said clearance.
 6. A deflection yoke according to the claim 1 wherein said ring cover has at the rear end of its ring surface a wall surface to be attached to the rear surface of the enlarged edge of the horizontal deflection coil.
 7. A ring cover according to claim 6 wherein stop segment engaging with the front surface of the enlarged edge of the horizontal deflection coil is provided at the front end of the ring surface of the ring cover, to thereby forming a channellike space into which the enlarged edge of the horizontal deflection coil is fitted.
 8. A ring cover according to the claim 3 wherein a wall surface to be attached to the rear surface of the enlarged edge of the horizontal deflection coil is provided at the rear end of the ring surface of the ring cover, and a cutout portion is formed on the wall surface. 